BS EN 14893:2006 pdf download – LPG equipment and accessories — Transportable Liquefied Petroleum Gas (LPG) welded steel pressure drums with a capacity between 150 litres and 1 000 litres
In no case shall the thickness be less than 2,5 mm. If the materials used for shell and ends are different, the calculation shall be carried out for each component using the appropriate properties. 5.4 Support loadings The drum and supports, if any, shall be designed to withstand the greater of the following;
1) static load when the drum is filled with water.
2) maximum operating mass of the drum subject to 2g acceleration acting vertically down and horizontally, and 1g acting vertically up. Where g is the acceleration due to gravity. This shall be demonstrated by experimental testing or calculation in accordance with a recognised pressure vessel standard or specification, e.g. EN 13445-3. Under the forces defined above, the stresses in the drum and its fastenings shall not exceed the following:
a) for general membrane stress in the shell, remote from the supports
– the normal design stress as defined in E.1;
b) for stresses local to the supports, determined either by experimental analysis or calculation/special analysis
– the limits specified in accordance with a recognised pressure vessel standard or specification. e.g. EN 13445-3.
5.5 Lifting lug loadings The lifting lugs shall be designed to accept the maximum loads anticipated during construction and handling in service, applying an acceleration of 2g vertically downwards and an assumed sling angle of 45º. This shall be demonstrated by experimental testing or calculation in accordance with a recognised pressure vessel standard or specification, e.g. EN 13445-3. Stress limits as specified in 5.4 apply.
5.6.1 General Drums shall be provided with the minimum number of openings required to satisfy the need for fittings to meet service requirements. Openings shall be positioned and/or grouped in such a way that their fittings can be protected as required by 5.7. For drums not fixed into a protective framework, the openings shall be located in the ends only.
5.6.2 Reinforcement Each opening shall be reinforced by a boss, pad or compensating plate attached by welding and designed in accordance with Annex E.
5.6.3 Position of welds The welds of opening reinforcements shall be clear of longitudinal and circumferential welds and welds of other opening reinforcements by a minimum of 40 mm between the weld edges.
5.6.4 Fittings connections
All connections, except for float gauges, shall be threaded or flanged and shall not exceed DN 50.
All threads for taper threaded connections shall comply with ANSI/ASME B1.20.1.
Flanged connections shall comply with EN 1092-1.
Float gauge connections shall comply with EN 13799.
5.7 Protection of fittings
Drums shall be such that all fittings are situated inside the contour of end shrouds or within a protective frame.
5.7.2 End shrouds End shrouds for drums intended to be rolled shall have a minimum thickness of 10 mm, or 7 mm if fitted with a reinforcing ring. The shrouds shall be attached to the receptacle by welding for at least 50 % of their circumference. Shrouds shall have holes or cutaways large enough to allow for drainage.
5.7.3 Protective frame Where fitted, the protective frame shall be designed to allow a safe handling of the assembly by mechanical means e.g. crane, forklift truck, 3 points system. The frame shall be a welded steel structure and shall be designed to protect the fittings against damage leading to leakage in service. This shall be demonstrated by the drop test specified in 12.4 The drum shall be totally or partly inserted and fixed in the frame by adequate means in a vertical or horizontal position.
5.7.4 Local protection In addition to the general protection specified in 5.7.1, 5.7.2 and 5.7.3, fittings shall be provided with local protection against unauthorised access.BS EN 14893 pdf download.